[GlobalISel] Use the DISubprogram for translation failure remarks.

Justin added support for DISubprogram locs in r295531 and r296052.
Use that instead of no-loc for constants and arguments.

llvm-svn: 296058
diff --git a/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp b/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
index 2df3810..0602e48 100644
--- a/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
@@ -89,7 +89,7 @@
     bool Success = translate(*CV, VReg);
     if (!Success) {
       OptimizationRemarkMissed R("gisel-irtranslator", "GISelFailure",
-                                 DebugLoc(),
+                                 MF->getFunction()->getSubprogram(),
                                  &MF->getFunction()->getEntryBlock());
       R << "unable to translate constant: " << ore::NV("Type", Val.getType());
       reportTranslationError(*MF, *TPC, *ORE, R);
@@ -1049,7 +1049,8 @@
   for (const Argument &Arg: F.args())
     VRegArgs.push_back(getOrCreateVReg(Arg));
   if (!CLI->lowerFormalArguments(EntryBuilder, F, VRegArgs)) {
-    OptimizationRemarkMissed R("gisel-irtranslator", "GISelFailure", DebugLoc(),
+    OptimizationRemarkMissed R("gisel-irtranslator", "GISelFailure",
+                               MF->getFunction()->getSubprogram(),
                                &MF->getFunction()->getEntryBlock());
     R << "unable to lower arguments: " << ore::NV("Prototype", F.getType());
     reportTranslationError(*MF, *TPC, *ORE, R);